JPS5826786Y2 - mizokiri knife - Google Patents

Description

[Detailed Description of the Invention] Fig. 1 is a front view of a groove cutting device of a corrugated box making machine that makes boxes generally called A type in a conventional corrugated board factory, and Fig. 2 is a side view of the same.

Further, FIG. 3 is an explanatory diagram showing a state in which a corrugated cardboard sheet is grooved, and FIG. 4 is a perspective view of the corrugated cardboard sheet after groove cutting.

In the figure, the sheet 1 conveyed from the previous process is rotated by shafts 2 and 3, which are rotating in synchronization with the conveyance speed of the sheet 1.
a knife 6 which is held between knife mounts 4 and 5 attached to the knife mounts 5 and has the same outer diameter as the knife mount 5;
The groove is cut by a knife 7 having a diameter larger than the outer diameter of the knife mount 4.

The knife 7 has a uniform thickness over its entire surface, and is mounted to the side surface of the knife mount 4 with mounting bolts 8 at right angles to the axis of the shaft 2.

Further, the knife 6.6 is mounted on the side surface of the knife mount 5 with a mounting bolt 10 at right angles to the axis of the shaft 3, with a spacing cylinder 9 that is slightly thicker than the knife 7 in between.

On the other hand, the knife mounts 4 and 5 are movable in the axial direction, and are moved to predetermined positions and fixed with set bolts 11 and 12.

When cutting grooves using the above device, the knife 7 itself crushes and cuts the front liner and middle liner of the corrugated cardboard sheet 1, as shown in Fig. 3.
(The outer liner may be torn with a small amount of deformation), resulting in a product with poor sharpness as shown in Figure 4.

That is, in the conventional device described above, since the knife 7 itself attempts to cut the sheet while crushing it, tension is generated on the sheet surface (front liner) due to the repulsive force (restoring force) of the step (Fig. 3).
However, before cutting with a knife, the front liner was torn irregularly due to tension, resulting in a poor quality product as shown in Figure 4.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and it has a shape that is approximately parallel to both side surfaces of the knife near the center in the thickness direction of the outer periphery of the knife, and whose length in the circumferential direction is approximately equal to the cutting edge of the knife.
Moreover, by providing a sharp protrusion protruding from the cutting edge toward the outer periphery and slanting toward the side surface of the knife,
It is an object of the present invention to provide a grooving knife that does not tear the outer liner irregularly, has good sharpness, and is capable of producing a high-quality product.

The embodiment of the present invention will be explained below with reference to the drawings. Fig. 5 is a front view of a grooving device with a grooving knife attached showing an embodiment of the present invention, Fig. 6 is a side view of the same, and Fig. 7 is a grooving device equipped with a grooving knife. FIG. 8 is a perspective view of the corrugated cardboard sheet after the grooves have been cut by the apparatus shown in FIG. 7.

Grooving knife 1 partially provided on the circumference in the figure
3 has a predetermined thickness, is approximately parallel to both side surfaces of the knife near the center of the outer periphery of the knife in the thickness direction, has approximately the same circumferential length as the knife, and protrudes in the outer circumferential direction from the cutting edge. Protrusion 1 with a sharp acute angle inclined in the direction of force
3a is provided, and is attached to the side surface of the mount 15 together with the pedestal 14 with a mounting bolt 16 at right angles to the axis of the shaft 17.

In addition, the knives 18, 18 are mounted on the side of the mounting base 20 with mounting bolts 21 at right angles to the axis of the shaft 22, with a spacer cylinder 19 having a predetermined thickness (slightly thicker than the thickness of the knife 13) in between. It has the same outer diameter as the mounting base 20.

23 is a key on the shaft 17, and 24 is a key on the shaft 22.

Further, the shafts 17 and 22 have separate drive sources so as to rotate in synchronization with the previous process, and are always connected to the outer periphery of the mount 15 and the knife 1.
The outer peripheral speed of No. 8 is synchronized with the speed of the corrugated cardboard sheet 25 conveyed from the previous process.

The mounts 15 and 20 are also movable on shafts 17 and 22, and are fixed at predetermined positions with set bolts 26 and 27, respectively.

Further, the distance between the shafts 17 and 22 can be freely adjusted using a separate adjustment device.

Next, to explain the operation of the embodiment described above, the corrugated cardboard sheet 25 sent from the previous process is held between the pedestal 14, the mounting base 15, and the knife 18, and at the same time, the protrusion 13a of the knife 13 removes chips. A cut is made in the center of the groove of the sheet, and after the tension on the surface of the corrugated sheet 25 is removed, a groove is cut to a predetermined groove width at the intersection A of the double-edged part of the knife 13 and the knife 18, and then sent out.

Note that the distance between the pedestal 14 and the mount 15 and the knife 18 is as follows:
It is adjusted so that the corrugated cardboard sheet 25 can be sandwiched to the extent that it can be transported.

Now, the grooving knife 13 shown in FIGS. 5 and 6 above
Although shown as an integrated knife, this knife may also be in the combined form shown in FIG. 9A.

That is, this is the cutting knife 28 and the groove cutting knife 2.
9 and 30 are separated, and the cutting knife 28 is held between the grooving knives 29 and 30 and tightened with the tightening bolt 31, but there is no difference in operation and effect.

Next, FIG. 10 A 2 ports, FIG. 11 A 2 ports, and FIG. 12 A 2 ports show examples of different structures of the cutting edge shapes of the cutting knife 13, and FIG. 10 shows a flat blade, Although FIG. 11 shows a saw blade and FIG. 12 shows a modified blade, there is no difference in their operation and effect.

In addition, in the knife 13 for cutting above, the protrusion 13
One protrusion 13a was provided near the center, but this protrusion 13a
There is no problem even if two (or several) are provided as shown in FIG.

As explained in detail above, the present invention has a structure in which the blade is located near the center in the thickness direction of the outer periphery of the knife, is approximately parallel to both side surfaces of the knife, has a circumferential length that is approximately equal to the cutting edge of the knife, and protrudes from the cutting edge in the outer circumferential direction. Since a sharp protrusion is provided that slopes toward the side of the knife, a continuous cut is made parallel to both sides of the knife near the center of the thickness of the part that will become chips before grooving. After removing the tension on the sheet surface, grooving can be performed.

Therefore, unlike conventional knives, the outer liner is not broken irregularly, so it is possible to obtain a product with good sharpness and high quality.

Note that the present invention is effective when applied to a groove cutting device for corrugated cardboard sheets.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a groove cutting device of a conventional corrugated box making machine, Fig. 2 is a side view of the same, and Fig. 3 shows a corrugated board sheet being grooved by the device shown in Fig. 1. FIG. 4 is a perspective view of the corrugated cardboard sheet grooved in FIG. 3, FIG. 5 is a front view of a groove cutting device equipped with a groove cutting knife showing an embodiment of the present invention, and FIG. 6 is the same. A side view, FIG. 7 is an explanatory diagram showing a state in which a corrugated cardboard sheet is grooved by the apparatus shown in FIG. 5, FIG. 8 is a perspective view of the corrugated cardboard sheet that has been grooved in FIG. , 1st
Figure 0A and Figure 11A and Figure 12A and Figure 12A and Figure 12 are front and side views of a grooving knife with a different structure, respectively, and Figure 13 is a front view and a side view of a grooving knife with a different structure. It is a front view of the grooving knife which shows an Example. Explanation of the main parts of the figure, 13...grooving knife,
13a...Protrusion, 18...Knife, 2
5... Cardboard sheet.

Claims (1)

[Scope of utility model registration request] A grooving knife for grooving a plate-shaped body partially provided on the circumference, and a pair of circular knives that form grooves into which the tips of the knives are inserted at intervals slightly wider than the thickness of the knives. In a grooving device that performs grooving by feeding a corrugated sheet to the meshing part with the slicing knife, there is a knife cutting edge that is approximately parallel to both sides of the knife and whose circumferential length is near the center in the thickness direction of the outer periphery of the slicing knife. A grooving knife characterized by being provided with a protrusion having a sharp acute angle, which is approximately equal to and protrudes in the outer circumferential direction from the cutting edge and is inclined in the direction of force on the side surface of the knife.